Overview
The OPA2378, produced by Texas Instruments, is a high-performance, low-noise operational amplifier that belongs to the Zerø-Drift, microPOWER™ series. This device is designed for low-voltage, single-supply operation and is optimized for applications requiring high precision and low power consumption. The OPA2378 is available in a SOT23-8 package and operates over a temperature range of –40°C to +125°C, making it suitable for a wide range of applications, including portable medical devices, battery-powered instruments, and sensor signal conditioning.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage, VS | 2.2 | 5.5 | V | ||
| Input Offset Voltage, VOS | VCM = V– | 20 | 70 | μV | |
| Input Bias Current, IB | ±150 | ±670 | pA | ||
| Gain-Bandwidth Product, GBW | 900 | kHz | |||
| Slew Rate, SR | G = +1 | 0.4 | V/μs | ||
| Settling Time 0.1%, tS | VS = 5.5V, 2V Step, G = +1 | 7 | μs | ||
| Quiescent Current (per Amplifier), IQ | IO = 0mA, VS = +5.5V | 125 | 150 | 165 | μA |
| Operating Temperature, TA | –40 | +125 | °C |
Key Features
- Low Noise: The OPA2378 features low noise with a voltage noise density of 90 nV/√Hz and no 1/f (flicker) noise, making it suitable for high-precision applications.
- MicroSIZE Packages: Available in SOT23-8 packages, these amplifiers are ideal for space-constrained designs.
- High Precision: Offers high precision with input offset voltages as low as 20 μV and a drift of 0.25 μV/°C.
- Rail-to-Rail Output: The output voltage swings within 10 mV of the supply rails, ensuring excellent performance in single-supply applications.
- High CMRR and PSRR: Features a common-mode rejection ratio (CMRR) of 112 dB and a power-supply rejection ratio (PSRR) of 1.5 μV/V, ensuring robust performance against common-mode and power-supply noise.
- Low Quiescent Current: Operates with a quiescent current of 125 μA per amplifier, making it suitable for battery-powered devices.
Applications
- Portable Medical Devices: Ideal for glucose meters, oxygen metering, and heart rate monitors.
- Weigh Scales: Suitable for precision weighing applications.
- Battery-Powered Instruments: Optimized for low-power operation, making it suitable for handheld test equipment and other battery-powered instruments.
- Thermopile Modules: Used in thermopile-based temperature sensing applications.
- Sensor Signal Conditioning: Excellent for conditioning signals from various sensors due to its high precision and low noise characteristics.
Q & A
- What is the typical input offset voltage of the OPA2378?
The typical input offset voltage of the OPA2378 is 70 μV.
- What is the gain-bandwidth product of the OPA2378?
The gain-bandwidth product of the OPA2378 is 900 kHz.
- What is the slew rate of the OPA2378?
The slew rate of the OPA2378 is 0.4 V/μs.
- What is the quiescent current per amplifier for the OPA2378?
The quiescent current per amplifier for the OPA2378 is 125 μA at VS = +5.5V.
- What is the operating temperature range of the OPA2378?
The operating temperature range of the OPA2378 is –40°C to +125°C.
- Can the OPA2378 operate with unregulated battery power?
Yes, the OPA2378 can operate with unregulated battery power due to its high power-supply rejection ratio (PSRR).
- What is the common-mode rejection ratio (CMRR) of the OPA2378?
The CMRR of the OPA2378 is typically 112 dB.
- What are the package options for the OPA2378?
The OPA2378 is available in a SOT23-8 package.
- Is the OPA2378 suitable for high-precision applications?
Yes, the OPA2378 is highly suitable for high-precision applications due to its low noise, low offset voltage, and high CMRR.
- Can the OPA2378 drive capacitive loads?
Yes, the OPA2378 can drive capacitive loads, but the specific load capacitance should be checked against the datasheet specifications.
